SWC-370: add ability to explicitly set the rendered attachment image size based on the width (aspect ratio is maintained). Tried to add this to the editor, but it became a confusing mess, but I think offering this advanced rendering feature via the markdown is the first step.
SWC-373: change code span color in markdown
Merge pull request #189 from jay-hodgson/develop

SWC-370: add ability to explicitly set the rendered attachment image size